Returning to corrinnalynn’s question:
If you’re exploring Catholicism I wouldn’t necessarily recommend you start with Mary. Mary is a difficult topic to delve into, and her role in salvation is continually discussed, with many of the laity pushing for declaration of the so-called Fifth Marian Dogma, and other parts of the laity either against it or apathetic.
I think you and we can agree that salvation came “through” Mary in the sense of her role in the Incarnation, her “yes” so to speak. What would have happened if Mary had said “no” - would Jesus have been born of another, would God have refused to save humanity, or was Mary incapable of saying “no” - is another matter that theologians debate.
So that’s one form of cooperation. The form of Mary’s cooperation that Pius X refers to is another, namely that Mary’s ongoing intercession in the life of every believer is necessary for salvation. The document you’re probably referring to is an encyclical, AD DIEM ILLUM LAETISSIMUM, which literally means “on this aboundingly joyful day”, issued 2/2/1904 with remarks on the Immaculate Conception of Mary.
This document can be found here:
vatican.va/holy_father/pius_x/encyclicals/documents/hf_p-x_enc_02021904_ad-diem-illum-laetissimum_en.html
The exact passage might be in paragraph 15. Remember this is a liturgical document, written in Latin and translated to English, and it’s a dense read:
15. These principles laid down, and to return to our design, who will not see that we have with good reason claimed for Mary that - as the constant companion of Jesus from the house at Nazareth to the height of Calvary, as beyond all others initiated to the secrets of his Heart, and as the distributor, by right of her Motherhood, of the treasures of His merits, - she is, for all these reasons, a most sure and efficacious assistance to us for arriving at the knowledge and love of Jesus Christ.
Those, alas! furnish us by their conduct with a peremptory proof of it,
who seduced by the wiles of the demon or deceived by false doctrines think they can do without the help of the Virgin. Hapless are they who neglect Mary under pretext of the honor to be paid to Jesus Christ! As if the Child could be found elsewhere than with the Mother!
Pope Piux X’s rationale is:
- Mary is entrusted by God with distributing all Graces, those necessary for salvation and those that sustain and bless us
- Mary’s will is entirely conformed to the Will of God so that she doesn’t play a “trump card” so to speak and refuse entry to Heaven to any whom Christ would welcome, nor can she admit any whom Christ opposes
- Thus prayer to Mary is necessary to obtain the graces one needs to be saved
It’s a difficult logic to follow and this probably isn’t the best document to explain it. I should note that in my three decades of being Catholic I’ve never heard a homily on this topic, and it’s not taught in the Catechism. Much of the Marian literature is like this, it’s difficult to understand and not commonly passed along in RCIA (religious instruction for adults), CCD /PSR (religious instruction for kids). You won’t find it unless you’re looking for it.
I think you’d be more comfortable exploring something like
lectio divina, which is a devotion to the Word by daily reading of and prayer on Scripture.